Disorder and the Supersolid State of Solid ${}^4$He

Abstract

We report torsional oscillator supersolid studies of highly disordered samples of solid ${}^4$He. In an attempt to approach the amorphous or glassy state of the solid, we prepare our samples by rapid freezing from the normal phase of liquid ${}^4$He. Less than two minutes is required for the entire process of freezing and the subsequent cooling of the sample to below 1 K. The supersolid signals observed for such samples are remarkably large, exceeding 20 % of the entire solid helium moment of inertia. These results, taken with the finding that the magnitude of the small supersolid signals observed in our earlier experiments can be reduced to an unobservable level by annealing, strongly suggest that the supersolid state exists for the disordered or glassy state of helium and is absent in high quality crystals of solid ${}^4$He.

4 pages, 5 figures

References in corpus (2)

• Ring exchanges and the supersolid phase of 4He
• Supersolid Helium at High Pressure

Cited by in corpus (28)

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• Observation of Unusual Mass Transport in Solid hcp 4He
• Nonclassical Rotational Inertia in Single Crystal Helium
• On the origin of the decrease in the torsional oscillator period of solid He4
• The effect of 3He impurities on the nonclassical response to oscillation of solid 4He
• A Gross-Pitaevskii Treatment for Supersolid He
• Probing the Upper Limit of Nonclassical Rotational Inertia
• Solid 4He and the Supersolid Phase: from Theoretical Speculation to the Discovery of a New State of Matter? A Review of the Past and Present Status of Research
• Theory of the superglass phase
• Thermal History of Solid 4He Under Oscillation
• Wetting Properties of Grain Boundaries in Solid Helium 4
• Quenched Dislocation Enhanced Supersolid Ordering
• Heat capacity peak in solid 4He: Effects of disorder and 3He impurities
• Torsional oscillator and synchrotron x-ray experiments on solid 4He in aerogel
• Binding of a 3He impurity to a screw dislocation in solid 4He
• Supersolids in one dimensional Bose Fermi mixtures
• Compressibility of solid helium
• Absence of low temperature anomaly on the melting curve of ${}^4$He
• Zero-point vacancies in quantum solids
• Two-dimensional molecular para-hydrogen and ortho-deuterium at zero temperature
• Classical and relativistic dynamics of supersolids: variational principle
• Effects of disorder on atomic density waves and spin-singlet dimers in one-dimensional optical lattices
• Dissipation peak as an indicator of sample inhomogeneity in solid ${}^4$He oscillator experiments
• Finite size Berezinski-Kosterlitz-Thouless transition at grain boundaries in solid ${}^4$He and role of ${}^3$He impurities
• Quantum plasticity and dislocation-induced supersolidity
• Surface instability and isotopic impurities in quantum solids